Screening of xylanolytic aspergillus fumigatus for prebiotic xylooligosaccharide production using bagasse

Abstract

Physicochemical properties, consumer acceptance, antioxidant and angiotensin-converting
\nenzyme (ACE) inhibitory activities of infusions and fermented beverages of Eucalyptus
\ncamaldulensis and Litsea glaucescens were compared. Among physicochemical parameters,
\nonly the pH of fermented beverages decreased compared with the unfermented
\ninfusions. No relevant changes were reported in consumer preference between infusions
\nand fermented beverages. Phenolic profi le measured by UPLC MS/MS analysis demonstrated
\nsignifi cant concentration changes of these compounds in plant infusions and fermented
\nbeverages. Fermentation induced a decrease in the concentration required to stabilize 50 %
\nof DPPH radical (i.e. lower IC50). Additionally, it enhanced the antioxidant activity measured
\nby the nitric oxide scavenging assay (14 % of E. camaldulensis and 49 % of L. glaucescens);
\nwhereas relevant improvements in the fermented beverage were not observed in the
\nlipid oxidation assay compared with unfermented infusions. The same behaviour was observed
\nin the inhibitory activity of ACE; however, both infusions and fermented beverages
\nhad lower IC50 than positive control (captopril). The present study demonstrated that fermentation
\nhas an infl uence on the concentration of phenolics and their potential bioactivity.
\nE. camaldulensis and L. glaucescens can be considered as natural sources of biocompounds
\nwith antihypertensive potential used either as infusions or fermented beverages.